A retired New York City cop and U.S. Marine wanted for allegedly assaulting a Washington, D.C., police officer with a metal flagpole during the Jan. 6 Capitol riot has surrendered on federal charges.

Thomas Webster, 54, who once provided security for New York mayor and City Hall, according to news reports , turned himself in Monday on six counts related to the beating of the officer captured on body camera footage during the pro-Trump insurrection, according to a federal complaint.

Webster was brought before U.S. Magistrate Judge Andrew Krause in White Plains, who reportedly expressed shock at video of the assault. He declared Webster may still be a threat to public safety and ordered him jailed without bail pending another hearing. The most serious charge forcible assault of an officer of the U.S. with a dangerous weapon carries a maximum of 20 years in prison if hes convicted.

The video footage appears to show Webster, whos from the upstate New York town of Florida, first verbally berating the officer, who stands behind a metal gate, and then physically lunging at him with the pole and then his bare hands.